diff --git a/client/src/App.tsx b/client/src/App.tsx
index 3896413..b5019d1 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react'
 import { useAuth } from './hooks/useAuth'
 import { LoginPage } from './pages/LoginPage'
 import { OnboardingPage } from './pages/OnboardingPage'
+import { GamePage } from './pages/GamePage'
 import './index.css'
 
 type AppRoute = 'login' | 'sent' | 'onboarding' | 'game' | 'admin'
@@ -51,15 +52,8 @@ export default function App() {
       {route === 'onboarding' && token && (
         <OnboardingPage token={token} onComplete={() => setRoute('game')} />
       )}
-      {route === 'game' && (
-        <div>
-          <h1 style={{ fontFamily: 'var(--font-header)' }}>Practice</h1>
-          <p>Hello, {profile?.display_name || profile?.email || 'Adventurer'}!</p>
-          <p>Game loop coming in Task 11.</p>
-          <button className="btn" style={{ marginTop: '1rem' }} onClick={() => { logout(); setRoute('login') }}>
-            Log out
-          </button>
-        </div>
+      {route === 'game' && token && (
+        <GamePage token={token} onLogout={() => { logout(); setRoute('login') }} />
       )}
       {route === 'admin' && (
         <div>
diff --git a/client/src/components/FlashArea.tsx b/client/src/components/FlashArea.tsx
new file mode 100644
index 0000000..b6e793d
--- /dev/null
+++ b/client/src/components/FlashArea.tsx
@@ -0,0 +1,15 @@
+type FlashAreaProps = { signal: 'dot' | 'dash' | null }
+
+export function FlashArea({ signal }: FlashAreaProps) {
+  const active = signal !== null
+  return (
+    <div style={{
+      width: '100%',
+      height: signal === 'dash' ? 120 : 80,
+      background: active ? 'var(--color-gold)' : '#2a1a0a',
+      border: '3px solid var(--color-forest)',
+      transition: 'background 0.05s, height 0.05s',
+      borderRadius: 4,
+    }} />
+  )
+}
diff --git a/client/src/components/PracticeCard.tsx b/client/src/components/PracticeCard.tsx
new file mode 100644
index 0000000..8456dfd
--- /dev/null
+++ b/client/src/components/PracticeCard.tsx
@@ -0,0 +1,106 @@
+import { useState, useEffect, useRef } from 'react'
+import { MORSE } from '../lib/morse'
+import { FlashArea } from './FlashArea'
+
+type PracticeCardProps = {
+  challenge: string        // the letter or word to guess
+  signal: 'dot' | 'dash' | null
+  isPlaying: boolean
+  onPlay: () => void
+  onAnswer: (answer: string) => void  // called when user submits
+  result: 'correct' | 'incorrect' | null
+  mnemonic: string | null
+}
+
+export function PracticeCard({
+  challenge, signal, isPlaying, onPlay, onAnswer, result, mnemonic
+}: PracticeCardProps) {
+  const [answer, setAnswer] = useState('')
+  const inputRef = useRef<HTMLInputElement>(null)
+
+  // Clear answer on new challenge (when result goes from non-null back to null)
+  useEffect(() => {
+    if (result === null) {
+      setAnswer('')
+      inputRef.current?.focus()
+    }
+  }, [result, challenge])
+
+  function submit() {
+    if (!answer.trim()) return
+    onAnswer(answer.trim().toUpperCase())
+  }
+
+  const morseDisplay = MORSE[challenge.toUpperCase()]
+    ? challenge.toUpperCase().split('').map(c => MORSE[c] ?? '').join('  ')
+    : ''
+
+  return (
+    <div>
+      <FlashArea signal={signal} />
+
+      <div style={{ textAlign: 'center', margin: '1.5rem 0' }}>
+        <button
+          className="btn"
+          onClick={onPlay}
+          disabled={isPlaying}
+          style={{ minWidth: 120 }}
+        >
+          {isPlaying ? 'Playing...' : 'Play'}
+        </button>
+      </div>
+
+      {/* Show morse pattern hint */}
+      {morseDisplay && (
+        <div style={{
+          textAlign: 'center',
+          fontFamily: 'var(--font-mono)',
+          fontSize: '1.2rem',
+          color: 'var(--color-gold)',
+          marginBottom: '1rem',
+          letterSpacing: '0.2em',
+        }}>
+          {morseDisplay.split('').map(c => c === '.' ? '·' : c === '-' ? '—' : ' ').join('')}
+        </div>
+      )}
+
+      {/* Answer input */}
+      <div style={{ display: 'flex', gap: '0.5rem', marginBottom: '1rem' }}>
+        <input
+          ref={inputRef}
+          type="text"
+          value={answer}
+          onChange={e => setAnswer(e.target.value)}
+          onKeyDown={e => { if (e.key === 'Enter') submit() }}
+          placeholder="Type your answer..."
+          disabled={result === 'correct'}
+          style={{ flex: 1 }}
+        />
+        <button
+          className="btn"
+          onClick={submit}
+          disabled={!answer.trim() || result === 'correct'}
+        >
+          Submit
+        </button>
+      </div>
+
+      {/* Result feedback */}
+      {result === 'correct' && (
+        <div style={{ padding: '1rem', background: '#d4edda', border: '2px solid #28a745', borderRadius: 4 }}>
+          <strong style={{ color: '#155724' }}>Correct! The answer was: {challenge.toUpperCase()}</strong>
+          {mnemonic && (
+            <p style={{ margin: '0.5rem 0 0', color: '#155724', fontStyle: 'italic' }}>
+              Your mnemonic: "{mnemonic}"
+            </p>
+          )}
+        </div>
+      )}
+      {result === 'incorrect' && (
+        <div style={{ padding: '1rem', background: '#fff3cd', border: '2px solid #ffc107', borderRadius: 4 }}>
+          <strong style={{ color: '#856404' }}>Try again, adventurer!</strong>
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/client/src/components/ScoreBar.tsx b/client/src/components/ScoreBar.tsx
new file mode 100644
index 0000000..c397b2d
--- /dev/null
+++ b/client/src/components/ScoreBar.tsx
@@ -0,0 +1,27 @@
+type ScoreBarProps = {
+  score: number
+  streak: number
+  level: number
+}
+
+const LEVEL_NAMES: Record<number, string> = { 1: 'Novice', 2: 'Operator' }
+
+export function ScoreBar({ score, streak, level }: ScoreBarProps) {
+  return (
+    <div style={{
+      display: 'flex',
+      gap: '1.5rem',
+      padding: '0.75rem 1rem',
+      background: 'var(--color-forest)',
+      color: 'var(--color-parchment)',
+      fontFamily: 'var(--font-body)',
+      fontSize: '0.9rem',
+      marginBottom: '1.5rem',
+      borderRadius: 4,
+    }}>
+      <span><strong style={{ color: 'var(--color-gold)' }}>{LEVEL_NAMES[level] ?? `Level ${level}`}</strong></span>
+      <span>Score: <strong>{score}</strong></span>
+      <span>Streak: <strong style={{ color: streak >= 5 ? 'var(--color-gold)' : 'inherit' }}>{streak}</strong></span>
+    </div>
+  )
+}
diff --git a/client/src/hooks/useMorseAudio.ts b/client/src/hooks/useMorseAudio.ts
new file mode 100644
index 0000000..17f1520
--- /dev/null
+++ b/client/src/hooks/useMorseAudio.ts
@@ -0,0 +1,38 @@
+import { useRef, useState, useCallback } from 'react'
+import { MorseAudioEngine } from '../lib/audio'
+import { DEFAULT_WPM } from '../lib/morse'
+
+type SignalType = 'dot' | 'dash' | null
+
+export function useMorseAudio() {
+  const engineRef = useRef<MorseAudioEngine | null>(null)
+  const [isPlaying, setIsPlaying] = useState(false)
+  const [currentSignal, setCurrentSignal] = useState<SignalType>(null)
+
+  function getEngine() {
+    if (!engineRef.current) {
+      const engine = new MorseAudioEngine()
+      engine.on('signal-start', ({ type }: { type: 'dot' | 'dash' }) => setCurrentSignal(type))
+      engine.on('signal-end', () => setCurrentSignal(null))
+      engine.on('play-end', () => { setIsPlaying(false); setCurrentSignal(null) })
+      engineRef.current = engine
+    }
+    return engineRef.current
+  }
+
+  const play = useCallback((text: string) => {
+    const engine = getEngine()
+    engine.stop()
+    setIsPlaying(true)
+    setCurrentSignal(null)
+    engine.play(text, DEFAULT_WPM)
+  }, [])
+
+  const stop = useCallback(() => {
+    engineRef.current?.stop()
+    setIsPlaying(false)
+    setCurrentSignal(null)
+  }, [])
+
+  return { play, stop, isPlaying, currentSignal }
+}
diff --git a/client/src/hooks/useProgress.ts b/client/src/hooks/useProgress.ts
new file mode 100644
index 0000000..8700d35
--- /dev/null
+++ b/client/src/hooks/useProgress.ts
@@ -0,0 +1,58 @@
+import { useState, useEffect, useCallback } from 'react'
+
+type Progress = {
+  level: number
+  score: number
+  streak: number
+  best_streak: number
+  total_correct: number
+  total_attempts: number
+}
+
+type LetterStats = Record<string, { correct: number; attempts: number }>
+
+export function useProgress(token: string | null) {
+  const [progress, setProgress] = useState<Progress | null>(null)
+  const [letterStats, setLetterStats] = useState<LetterStats>({})
+  const [mnemonics, setMnemonics] = useState<Record<string, string>>({})
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    if (!token) return
+    const headers = { Authorization: `Bearer ${token}` }
+    Promise.all([
+      fetch('/api/progress', { headers }).then(r => r.json()),
+      fetch('/api/mnemonics', { headers }).then(r => r.json()),
+    ])
+      .then(([prog, mnems]) => {
+        setProgress(prog)
+        setMnemonics(mnems)
+      })
+      .finally(() => setLoading(false))
+  }, [token])
+
+  const recordAnswer = useCallback(async (letter: string, correct: boolean): Promise<Progress> => {
+    const headers = token ? { Authorization: `Bearer ${token}` } : {}
+    const r = await fetch('/api/progress/answer', {
+      method: 'POST',
+      headers: { ...headers, 'Content-Type': 'application/json' },
+      body: JSON.stringify({ letter, correct }),
+    })
+    const updated: Progress = await r.json()
+    setProgress(updated)
+    // Update local letter stats
+    setLetterStats(prev => {
+      const stat = prev[letter.toUpperCase()] ?? { correct: 0, attempts: 0 }
+      return {
+        ...prev,
+        [letter.toUpperCase()]: {
+          correct: stat.correct + (correct ? 1 : 0),
+          attempts: stat.attempts + 1,
+        },
+      }
+    })
+    return updated
+  }, [token])
+
+  return { progress, letterStats, mnemonics, loading, recordAnswer }
+}
diff --git a/client/src/pages/GamePage.tsx b/client/src/pages/GamePage.tsx
new file mode 100644
index 0000000..97d87ae
--- /dev/null
+++ b/client/src/pages/GamePage.tsx
@@ -0,0 +1,130 @@
+import { useState, useEffect, useCallback, useRef } from 'react'
+import { pickChallenge, NOVICE_LETTERS, OPERATOR_WORDS } from '../lib/morse'
+import { useMorseAudio } from '../hooks/useMorseAudio'
+import { useProgress } from '../hooks/useProgress'
+import { ScoreBar } from '../components/ScoreBar'
+import { PracticeCard } from '../components/PracticeCard'
+
+type GamePageProps = {
+  token: string
+  onLogout: () => void
+}
+
+export function GamePage({ token, onLogout }: GamePageProps) {
+  const audio = useMorseAudio()
+  const { progress, letterStats, mnemonics, loading, recordAnswer } = useProgress(token)
+  const [challenge, setChallenge] = useState<string | null>(null)
+  const [result, setResult] = useState<'correct' | 'incorrect' | null>(null)
+  const [showLevelUp, setShowLevelUp] = useState(false)
+  const recentHistoryRef = useRef<string[]>([])
+  const incorrectRecordedRef = useRef(false)
+
+  // Pick a new challenge based on current level
+  const nextChallenge = useCallback(() => {
+    const level = progress?.level ?? 1
+    const pool = level >= 2 ? OPERATOR_WORDS : NOVICE_LETTERS
+    const c = pickChallenge(pool, letterStats, recentHistoryRef.current)
+    recentHistoryRef.current = [...recentHistoryRef.current.slice(-4), c]
+    setChallenge(c)
+    setResult(null)
+    incorrectRecordedRef.current = false
+    audio.stop()
+  }, [progress?.level, letterStats])
+
+  // Load first challenge after progress loads
+  useEffect(() => {
+    if (!loading && progress && !challenge) {
+      nextChallenge()
+    }
+  }, [loading, progress])
+
+  async function handleAnswer(answer: string) {
+    if (!challenge || result === 'correct') return
+    const isCorrect = answer === challenge.toUpperCase()
+    setResult(isCorrect ? 'correct' : 'incorrect')
+
+    if (isCorrect) {
+      const updated = await recordAnswer(challenge, true)
+      // Level-up trigger: 10 consecutive correct
+      if (updated.streak > 0 && updated.streak % 10 === 0) {
+        setShowLevelUp(true)
+      }
+    } else if (!incorrectRecordedRef.current) {
+      // Only record first incorrect attempt per challenge (allow re-tries without inflating stats)
+      incorrectRecordedRef.current = true
+      await recordAnswer(challenge, false)
+    }
+  }
+
+  function playChallenge() {
+    if (!challenge) return
+    audio.play(challenge)
+  }
+
+  if (loading || !progress || !challenge) {
+    return (
+      <div style={{ textAlign: 'center', paddingTop: '3rem' }}>
+        <p style={{ fontFamily: 'var(--font-header)' }}>Loading quest...</p>
+      </div>
+    )
+  }
+
+  return (
+    <div>
+      <ScoreBar score={progress.score} streak={progress.streak} level={progress.level} />
+
+      <PracticeCard
+        challenge={challenge}
+        signal={audio.currentSignal}
+        isPlaying={audio.isPlaying}
+        onPlay={playChallenge}
+        onAnswer={handleAnswer}
+        result={result}
+        mnemonic={mnemonics[challenge.toUpperCase()] ?? null}
+      />
+
+      {result === 'correct' && (
+        <div style={{ textAlign: 'center', marginTop: '1.5rem' }}>
+          <button className="btn" onClick={nextChallenge}>
+            Next Challenge
+          </button>
+        </div>
+      )}
+
+      {/* Level-up modal */}
+      {showLevelUp && (
+        <div style={{
+          position: 'fixed', inset: 0,
+          background: 'rgba(0,0,0,0.6)',
+          display: 'flex', alignItems: 'center', justifyContent: 'center',
+          zIndex: 100,
+        }}>
+          <div style={{
+            background: 'var(--color-parchment)',
+            border: '3px solid var(--color-gold)',
+            padding: '2rem',
+            maxWidth: 380,
+            textAlign: 'center',
+          }}>
+            <h2 style={{ fontFamily: 'var(--font-header)', marginBottom: '1rem' }}>
+              Quest Complete!
+            </h2>
+            <p style={{ marginBottom: '1.5rem' }}>
+              10 in a row! {progress.level < 2 ? "You've advanced to Operator level!" : 'Outstanding skill!'}
+            </p>
+            <button className="btn" onClick={() => { setShowLevelUp(false); nextChallenge() }}>
+              Continue
+            </button>
+          </div>
+        </div>
+      )}
+
+      {/* Nav */}
+      <div style={{ marginTop: '2rem', borderTop: '1px solid var(--color-brown)', paddingTop: '1rem' }}>
+        <button className="btn btn-ghost" onClick={onLogout} style={{ fontSize: '0.85rem' }}>
+          Log out
+        </button>
+      </div>
+    </div>
+  )
+}